
Grease or debris, coupled with die deterioration, causes a filled mintmark, evidenced on many coins, including Morgan dollars. But the “1921-S VAM 6B, Filled S” dollar is special because the mintmark has a flaw in the die as well as a gouge on the obverse.
Before we delve into this variety, we need to define some terms, beginning with VAMs, initials of numismatists Van Allen and Mallis who cataloged die varieties of U.S. Morgan and Peace silver dollars.
You can learn more about VAMs by reading this article by Jack Riley.
As noted earlier, the specific die marker for this coin is: VAM 6B.
In addition to the filled “S” mintmark, the 1921-S variety has a die gouge on the obverse, making it more valuable than a regular issue.
A die gouge can be mistaken at times for a die crack. So we have to define those, too.
Die gouges occur when a foreign object is dragged across the die face, allowing metal to fill the divot, resulting in a raised area. Sometimes the dragged object creates a line, as in the 1921-S VAM 6B dollar. It may appear like a die crack. The difference is a gouge is created by that foreign object whereas a die crack results from pressure during the striking process.
Here’s an example:

Now that we know those terms, we can discuss the die markers of the 1921-S VAM 6B.
Let’s look at the filled S mintmark first:

The filled mintmark of this Morgan variety differs from a grease strike because the “S” also exhibits a flaw in the die, distorting the S. Compare:

Now let’s look closely at the die gouge:

Not all die gouges are straight lines as here. In this case, the dragged object caused the line.
This particular variety carries a unique number in the PCGS catalogue (412698) from which these photos have been taken.

PCGS CoinFacts also lists values for this variety. Compare the prices with a regular 1921-S:

As you can see, the higher the grade on this variety, the more valuable.
While you may not be interested in this Morgan, going through the die markers here–or any VAM–will help you learn more about the minting process.
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